Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ac85e3a22c7c1a…

MALICIOUS

PDF

78.8 KB Created: 2021-08-30 19:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e4981896ff0046a48418148a7fdba77 SHA-1: 6f5627bc277ab74a1badc068517e6bbdfd1913b9 SHA-256: c9ac85e3a22c7c1a859331f83bebdc84e44decd5dd57b582a81dc3a3331302fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://feach.ie/images/uploads/file/51306240190.pdf In PDF document text
    • http://engineersclasses4competition.com/files/others/sezadibojefilusenisazo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd633681b0---89293773432.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/90560619034.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/85192103069.pdfIn PDF document text
    • https://amblamy.ee/upload/file/17267106994.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/87936547933.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2a923b50ae2c730d895b344505473bc0/vapujofujokesebilid.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/66525314164.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c5e7f661b24b25b8e4030b56b713ca23/gelikelikopita.pdfIn PDF document text
    • http://dgjst.com/upfile/file/62589320631.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/likusipujixega.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/56404548627.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372dc509d---vovetuvirosax.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5hrc3e1e71977pqusm4sjcl3bt/seporepari.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/13412496350.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0d2ac5e72532a2eef9d6f7c3614ed0cc/16530351907.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7907823f4b5814d8ce753f6d3c7c9fc0/99866254587.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a1c48afb868164b7a9fb705a1ad1bb9a/visabewizatasi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8ef5b1b1---dibobatezuwizakabaxajun.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e1c34e04---nasovaxiweb.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3cd5b197d2bdd2bdd4d3c2f4fa8dff97/98855011776.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/muvibipusekoxakugelubim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=physical+education+project+on+cricket+for+class+12+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 17128 bytes
SHA-256: 13fb578703aa2a71f4b776d87ca5fd79539321150f4bf5cd049734c6a9e4d7be
font_01_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 11324 bytes
SHA-256: b1d45721f289346d5368902b7a9b9b5e124ea3367ec5781ff960dea840fd894f
font_02_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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